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TMS320F2812: SPRABT3

Part Number: TMS320F2812


SPRABT3 (Software Phase Locked Loop Design Using C2000™ Microcontrollers for Single Phase Grid Connected Inverter)

Upon the figure 3 in SPRABT3(Chapter 2.2), ζ2 and ζ1 is given as 0.00001 and 0.1, How can I affirm the value of ζ2 and ζ1?